diff --git a/lib/Activity/Provider.php b/lib/Activity/Provider.php
index 6782a791..9cda792e 100644
--- a/lib/Activity/Provider.php
+++ b/lib/Activity/Provider.php
@@ -48,7 +48,7 @@ public function __construct(IFactory $languageFactory, IURLGenerator $urlGenerat
 		$this->urlGenerator = $urlGenerator;
 	}
 
-	public function parse($language, IEvent $event, IEvent $previousEvent = null) {
+	public function parse($language, IEvent $event, ?IEvent $previousEvent = null) {
 		if ($event->getApp() !== Application::APP_NAME || $event->getType() !== self::TYPE_VIRUS_DETECTED) {
 			throw new \InvalidArgumentException();
 		}
diff --git a/lib/AvirWrapper.php b/lib/AvirWrapper.php
index 74138f05..04fe887a 100644
--- a/lib/AvirWrapper.php
+++ b/lib/AvirWrapper.php
@@ -76,7 +76,7 @@ public function fopen($path, $mode) {
 		return $stream;
 	}
 
-	public function writeStream(string $path, $stream, int $size = null): int {
+	public function writeStream(string $path, $stream, ?int $size = null): int {
 		if ($this->shouldWrap($path)) {
 			$stream = $this->wrapSteam($path, $stream);
 		}
diff --git a/lib/Command/Test.php b/lib/Command/Test.php
index 54b7c4f8..73444f19 100644
--- a/lib/Command/Test.php
+++ b/lib/Command/Test.php
@@ -72,7 +72,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 			$details = $result->getDetails();
 			$output->writeln("<error>❌ $details</error>");
 			return 1;
-		} else if ($result->getNumericStatus() === Status::SCANRESULT_UNCHECKED) {
+		} elseif ($result->getNumericStatus() === Status::SCANRESULT_UNCHECKED) {
 			$output->writeln("<comment>- file not scanned or scan still pending</comment>");
 		} else {
 			$output->writeln("<info>✓</info>");
@@ -92,7 +92,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 			$details = $result->getDetails();
 			$output->writeln("<error>❌ file not detected $details</error>");
 			return 1;
-		} else if ($result->getNumericStatus() === Status::SCANRESULT_UNCHECKED) {
+		} elseif ($result->getNumericStatus() === Status::SCANRESULT_UNCHECKED) {
 			$output->writeln("<comment>- file not scanned or scan still pending</comment>");
 		} else {
 			$output->writeln("<info>✓</info>");
@@ -113,7 +113,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 			$details = $result->getDetails();
 			$output->writeln("<error>❌ file not detected $details</error>");
 			return 1;
-		} else if ($result->getNumericStatus() === Status::SCANRESULT_UNCHECKED) {
+		} elseif ($result->getNumericStatus() === Status::SCANRESULT_UNCHECKED) {
 			$output->writeln("<comment>- file not scanned or scan still pending</comment>");
 		} else {
 			$output->writeln("<info>✓</info>");
diff --git a/lib/Controller/RuleController.php b/lib/Controller/RuleController.php
index 1d6c3185..f25a86b5 100644
--- a/lib/Controller/RuleController.php
+++ b/lib/Controller/RuleController.php
@@ -8,12 +8,12 @@
 
 namespace OCA\Files_Antivirus\Controller;
 
-use \OCA\Files_Antivirus\Db\Rule;
-use \OCA\Files_Antivirus\Db\RuleMapper;
-use \OCP\AppFramework\Controller;
+use OCA\Files_Antivirus\Db\Rule;
+use OCA\Files_Antivirus\Db\RuleMapper;
+use OCP\AppFramework\Controller;
 
-use \OCP\IRequest;
 use OCP\AppFramework\Http\JSONResponse;
+use OCP\IRequest;
 
 class RuleController extends Controller {
 	/** @var RuleMapper */
diff --git a/lib/Controller/SettingsController.php b/lib/Controller/SettingsController.php
index d6913129..c44c1e99 100644
--- a/lib/Controller/SettingsController.php
+++ b/lib/Controller/SettingsController.php
@@ -8,14 +8,14 @@
 
 namespace OCA\Files_Antivirus\Controller;
 
-use \OCA\Files_Antivirus\AppConfig;
-use \OCP\AppFramework\Controller;
-use \OCP\AppFramework\Http\JSONResponse;
-use \OCP\IL10N;
-use \OCP\IRequest;
+use OCA\Files_Antivirus\AppConfig;
 use OCA\Files_Antivirus\Scanner\ScannerFactory;
-
 use OCA\Files_Antivirus\Status;
+use OCP\AppFramework\Controller;
+use OCP\AppFramework\Http\JSONResponse;
+use OCP\IL10N;
+
+use OCP\IRequest;
 
 class SettingsController extends Controller {
 	/**
diff --git a/lib/ICAP/ICAPRequest.php b/lib/ICAP/ICAPRequest.php
index edcb0b2f..9031232e 100644
--- a/lib/ICAP/ICAPRequest.php
+++ b/lib/ICAP/ICAPRequest.php
@@ -42,7 +42,7 @@ public function __construct(
 		array $headers,
 		array $requestHeaders,
 		array $responseHeaders,
-		callable $responseCallback = null
+		?callable $responseCallback = null
 	) {
 		$this->stream = $stream;
 		$this->responseCallback = $responseCallback;
diff --git a/lib/ICAP/ResponseParser.php b/lib/ICAP/ResponseParser.php
index a4d6ce09..4ce713f8 100644
--- a/lib/ICAP/ResponseParser.php
+++ b/lib/ICAP/ResponseParser.php
@@ -23,7 +23,7 @@
 
 namespace OCA\Files_Antivirus\ICAP;
 
-use \RuntimeException;
+use RuntimeException;
 
 class ResponseParser {
 	/**
diff --git a/lib/Scanner/ICAP.php b/lib/Scanner/ICAP.php
index 143c6074..1d717f4c 100644
--- a/lib/Scanner/ICAP.php
+++ b/lib/Scanner/ICAP.php
@@ -31,7 +31,6 @@
 use OCA\Files_Antivirus\Status;
 use OCA\Files_Antivirus\StatusFactory;
 use OCP\ICertificateManager;
-use OCP\IRequest;
 use Psr\Log\LoggerInterface;
 
 class ICAP extends ScannerBase {
@@ -133,8 +132,9 @@ protected function scanBuffer() {
 			if (\strpos($respHeader, '403 Forbidden') || \strpos($respHeader, '403 VirusFound')) {
 				$this->status->setNumericStatus(Status::SCANRESULT_INFECTED);
 			}
-		} else if ($code === 202) {
-			$this->status->setNumericStatus(Status::SCANRESULT_UNCHECKED);;
+		} elseif ($code === 202) {
+			$this->status->setNumericStatus(Status::SCANRESULT_UNCHECKED);
+			;
 		} else {
 			throw new \RuntimeException('Invalid response from ICAP server');
 		}
diff --git a/lib/Scanner/ScannerFactory.php b/lib/Scanner/ScannerFactory.php
index 63078c94..9d9e6cfc 100644
--- a/lib/Scanner/ScannerFactory.php
+++ b/lib/Scanner/ScannerFactory.php
@@ -10,7 +10,6 @@
 
 use OCA\Files_Antivirus\AppConfig;
 use OCP\IRequest;
-use OCP\IServerContainer;
 use Psr\Container\ContainerInterface;
 
 class ScannerFactory {